one reason for ufo sightings
An unmanned Air Force space plane dropped out of orbit and glided to a computer-controlled California landing early Saturday to close out a classified 469-day military mission. The reusable Boeing-built X-37B Orbital Test Vehicle touched down on a runway at Vandenberg Air Force Base, Calif., at 5:48 a.m. PDT (GMT-7). The Air Force did not provide any advance warning of the re-entry and landing time and no technical details about the vehicle's performance were released. The Air Force's unmanned X-37B spaceplane glided to a pinpoint landing at Vandenberg Air Force Base, Calif., Saturday after 15-and-a-half months in orbit on a classified military mission. (Credit: U.S. Air Force) But in a statement, the Air Force said the autonomous landing by the nation's "newest and most advanced re-entry spacecraft" was executed "safely and successfully." "With the retirement of the space shuttle fleet, the X-37B OTV program brings a singular capability to sp